Jack
River rainforest is bounded by the Grand Ridge Road and Hour Track to
the north, Jack Road to the east and south and the Yarram/Madalya Road
to the west.

There has been
a lot less plantation activity on the tributary flowing south/west from
Hour Track than the tributary west of Cockrem Track. The rainforest
within the tributary south of Hour Track is a great deal wider and more
dense than that on the western tributary. In a number of places the
rainforest extends up spurs for more than 100 metres. This tributary
is also an extremely rich site for slender and skirted tree ferns. However,
tracks and plantation activities into the headwaters from Hour Track
and Jack Track have resulted in erosion and blocked water flow on the
eastern side of the headwaters.

Most
of the area surrounding the rainforest in this eastern tributary is
native vegetation consisting of Wet Scherophyll forest containing large
numbers of mature mountain ash and Blackwood forest. There are some
areas of Messmate forest on the eastern side of the tributary, adjacent
to Jack Track. In the northwest corner there has been some attempt to
establish mountain ash plantation, mainly from Cockrem Track, but most
of this is failed plantation and has reverted to native vegetation.